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https://issues.apache.org/jira/browse/MAPREDUCE-3715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13192038#comment-13192038
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Harsh J commented on MAPREDUCE-3715:
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We store out the locations separately during submission anyway, so I guess this
was done for saving the size of metadata written during submission. It has been
this way since 0.18.
We can document it, but were you looking for location info from inside a record
reader? How were you planning to use it?
> FileSplit's Writable implementation discards hosts information
> --------------------------------------------------------------
>
> Key: MAPREDUCE-3715
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3715
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 0.20.2, 1.0.0
> Reporter: Pavel Podgoretsky
> Priority: Minor
>
> org.apache.hadoop.mapreduce.lib.input.FileSplit's write() does not write out
> hosts, and readFields() sets them to null.
> If this is intended then it should be documented very clearly. But it looks
> more like an oversight to me.
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